Category III 4in Stainless Steel Horizontal Vent Kit Made to be used with the Heatstar by Enerco or Mr. Heater Big Maxx Indirect Fired Unit Heater for horizontal venting. This kit is designed to fit the MHU75, HSU75, MHU80 and HSU80 model unit heaters. It is designed for vertical installation only. Other select parts may be required for your installation needs. Vent kit for horizontal 4 in. exhaust, Big Maxx, Unit heaters, Tube heaters, Hot water heaters, Stainless steel new 2012 standards Includes: 1 - 3 in. to 4 in. adapter, 1 - 4 in. x 12 in. B-vent pipe, 1 - 4 in. x 24 in. vent pipe, 1 - 4 in. 90 degree elbow, wall thimble, roof flashing, storm collar, vent cap For use with MHU75, HSU75, MHU80, HSU80 Unit Heaters
